Bi-Weekly Mortgage Payment Calculator
Pay half your monthly mortgage payment every two weeks instead of once a month. That's 26 half-payments a year — the equivalent of 13 monthly payments — so the extra month goes straight to principal. See exactly how much interest you save and how many years you shave off, with optional extra payments.
Educational estimate, not financial advice. This tool models principal & interest only and is not a quote or payoff statement from your lender. Confirm any payment plan with your loan servicer before relying on it.
Calculate your bi-weekly plan
Bi-weekly payment
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every 2 weeks
Interest saved vs monthly
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–
Payoff time (bi-weekly)
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–
Estimated payoff date
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based on your start date
| Monthly plan | Bi-weekly plan | |
|---|---|---|
| Payment | – | – |
| Payments per year | 12 | 26 |
| Total paid per year | – | – |
| Number of payments | – | – |
| Time to payoff | – | – |
| Total interest | – | – |
| Total paid | – | – |
Bi-weekly means – extra toward principal each year — exactly one additional monthly payment.
Worked example: $300,000 at 6.5%, 30 years
- Monthly payment: M = P·i / (1 − (1+i)−n) with i = 0.065/12 and n = 360 → $1,896.20/month.
- Bi-weekly payment: half of monthly = $948.10 every two weeks. Per-period rate = (1+i)12/26−1, the effective equivalent of monthly compounding.
- Result: 626 bi-weekly payments → paid off in 24.08 years instead of 30. Total interest drops from $382,633.47 to $293,288.66.
- Savings: $89,344.81 less interest, 5.92 years early — from one extra monthly payment per year ($1,896.20) applied to principal.
Numbers above are produced by this page's own engine (see vectors.json test vectors) and match the standard amortization formula.
What this calculator does & does not do
- Does: model pure bi-weekly payment frequency (26 half-payments/year), compare vs the standard monthly plan, and add optional extra principal per period.
- Does not include property taxes, homeowners insurance, HOA dues, or PMI — those are usually paid monthly via escrow. For a full monthly payment with taxes & insurance, see the related tools.
- Does not replace a general extra-payments plan on a monthly schedule — see the mortgage calculator with extra principal payments.
Mortgage Calculator with Extra Principal PaymentsModel extra payments on a standard monthly schedule
Monthly Payment Calculator: Mortgage, Taxes & InsuranceFull monthly payment including escrow items
Mortgage Insurance LabExplore PMI costs and removal timing
Mortgage Refinance Break-EvenWhen refinancing pays for itself
Methodology
The monthly payment uses the standard amortization formula with nominal monthly compounding. Bi-weekly periods use the effective equivalent rate (1 + monthly rate)12/26 − 1, so a bi-weekly year carries exactly the same effective interest as a monthly year — the comparison is apples-to-apples. Each simulated payment covers that period's interest first, then reduces principal; the schedule stops when the balance reaches zero (the final payment is smaller than a full period payment).
Principal & interest only. Real servicers may accrue interest daily or round differently; results are estimates for planning, not payoff quotes.
Frequently asked questions
How does a bi-weekly mortgage payment plan work?
Instead of one full payment each month, you pay half your monthly payment every two weeks. Because a year has 52 weeks, you make 26 half-payments, which equals 13 full monthly payments instead of 12. That extra monthly payment goes straight to principal, so you pay less interest and finish years early.
How much can bi-weekly payments save on a mortgage?
It depends on your loan amount, rate, and term. As an example, a $300,000 loan at 6.5% over 30 years costs $382,633 in interest on a monthly plan. Paying half the monthly payment ($948.10) every two weeks pays the loan off in about 24.1 years and saves about $89,345 in interest, 5.9 years early. Enter your own numbers above for an exact estimate.
Is bi-weekly the same as making one extra monthly payment per year?
Very close, but bi-weekly is slightly better. With one extra monthly payment a year you also make 13 payments, but bi-weekly applies the extra principal a little earlier each cycle (every two weeks instead of once a year), so interest accrues on a slightly smaller balance. The difference is usually a few hundred dollars over the life of a 30-year loan.
Can I get the same result with extra principal payments on my monthly plan?
Yes. Dividing your monthly payment by 12 and adding that amount as extra principal each month produces nearly the same result as a bi-weekly plan, and it works even if your lender does not offer a formal bi-weekly program. Use the extra payment field above to model both approaches.
Do all lenders offer bi-weekly mortgage plans?
No. Some lenders offer formal bi-weekly plans, some charge a setup or per-payment fee for them, and some do not offer them at all. Always confirm that extra amounts are applied to principal (not held in suspense or applied to future payments), and check for fees before enrolling.
Does this calculator include taxes, insurance, or PMI?
No. This calculator covers principal and interest only, so it isolates the pure effect of payment frequency. Taxes, homeowners insurance, HOA dues, and PMI are usually paid monthly through escrow and are not affected by a bi-weekly schedule.
How is interest calculated in this calculator?
The monthly payment uses the standard amortization formula with nominal monthly compounding. Bi-weekly periods use the effective equivalent rate, (1 + monthly rate)^(12/26) - 1, so a bi-weekly year carries exactly the same effective interest as a monthly year. The simulation applies each payment to interest first, then principal, and stops when the balance reaches zero.
Is this result an official payoff quote from my lender?
No. This is an educational estimate for planning purposes, not financial advice and not a quote from your lender. Real loans may accrue interest daily, round payments differently, or apply extra amounts under different rules. Confirm any payoff plan with your loan servicer before relying on it.
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